semantic_vers.cpp

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/***************************************************************************
 *   Copyright (C) 2019 Alec Leamas                                        *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, see <https://www.gnu.org/licenses/>. *
 **************************************************************************/
 
#include "config.h"
 
#include <algorithm>
#include <cstdio>
#include <string>
#include <sstream>
 
#include "model/semantic_vers.h"
 
#undef major  // work around gnu's major() and minor() macros.
#undef minor
 
SemanticVersion SemanticVersion::parse(std::string s) {
  using namespace std;
 
  SemanticVersion vers;
  size_t pos = s.find('+');
  if (pos != string::npos) {
    vers.build = s.substr(pos + 1);
    s = s.substr(0, pos);
  }
  pos = s.find('-');
  if (pos != string::npos) {
    vers.pre = s.substr(pos + 1);
    s = s.substr(0, pos);
  }
 
  // Ignore prefixes like 'v', 'rc'. etc.
  while (s.size() && (s[0] < '0' || s[0] > '9')) s = s.substr(1);
 
  int r = sscanf(s.c_str(), "%d.%d.%d.%d", &vers.major, &vers.minor,
                 &vers.patch, &vers.post);
  if (r < 2) {
    vers.major = -1;
  }
  return vers;
}
 
SemanticVersion::SemanticVersion()
    : major(0), minor(0), patch(0), post(0), pre(""), build("") {}
 
SemanticVersion::SemanticVersion(int major, int minor, int patch, int post,
                                 std::string pre, std::string build) {
  this->major = major;
  this->minor = minor;
  this->patch = patch;
  this->post = post;
  this->pre = pre;
  this->build = build;
}
 
bool SemanticVersion::operator<(const SemanticVersion& other) {
  if (major != other.major) return major < other.major;
  if (minor != other.minor) return minor < other.minor;
  if (patch != other.patch) return patch < other.patch;
  if (post != other.post) return post < other.post;
  return pre < other.pre;
}
 
bool SemanticVersion::operator==(const SemanticVersion& other) {
  return major == other.major && minor == other.minor && patch == other.patch &&
         post == other.post && pre == other.pre;
}
 
bool SemanticVersion::operator>(const SemanticVersion& other) {
  return !(*this == other) && !(*this < other);
}
 
bool SemanticVersion::operator<=(const SemanticVersion& other) {
  return (*this == other) || (*this < other);
}
 
bool SemanticVersion::operator>=(const SemanticVersion& other) {
  return (*this == other) || (*this > other);
}
 
bool SemanticVersion::operator!=(const SemanticVersion& other) {
  return !(*this == other);
}
 
std::ostream& operator<<(std::ostream& s, const SemanticVersion& v) {
  if ((v.major == 0) && (v.minor == 0) && (v.patch == 0)) return s;
 
  s << v.major << '.' << v.minor;
  if (v.patch != -1) {
    s << '.' << v.patch;
  }
  if (v.post != 0) {
    s << '.' << v.post;
  }
  if (v.pre != "") {
    s << '-' << v.pre;
  }
  if (v.build != "") {
    s << '+' << v.build;
  }
  return s;
}
 
std::string SemanticVersion::to_string() {
  std::ostringstream os;
  os << *this;
  return os.str();
}